They may have incorporated it within the tune - you need to check - however it wont work without a complimentary Transmission Control Unit (TCU) flash as well. Unfortunately when last I looked, the TCU needs to be sent away = time car is off road....or EC (for $200) will send the tune on a spare TCU - plug and play. That way you have both worlds.
Also in the TCU tune is the manual W/S option.

Many have reported good benefits in the tune previously.